<template>
	<view>
		<view class="goods-list">
			<!-- block启包裹作用，让解构更加清晰 -->
			<view v-for="(goods,i) in goodsList" :key="i" @click="gotoDetail(goods)">
				<my-goods :goods="goods"></my-goods>
			</view>
			
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				queryObj:{
					query:'',
					cid:'',
					pagenum: 1,
					pagesize:10
				},
				goodsList: [],
				//total实现分页效果
				total:0,
				//节流阀
				isloading:false
			};
		},
		onLoad(options) {
			//在页面加载时将数据转存
			this.queryObj.query = options.query || ''
			this.queryObj.cid = options.cid || ''
			this.getGoodsList()
		},
		methods:{
			//获取商品列表数据的方法
			async getGoodsList(cb){
				//打开节流阀
				this.isloading = true
				const {data:res}= await uni.$http.get('/api/public/v1/goods/search',this.queryObj)
				//关闭节流阀
				this.isloading = false
				//如果这个cb值存在就进行调用，调用了cb就能关闭下拉刷新的效果
				cb && cb()
				if(res.meta.status !==200) return uni.$showMsg()
				
				//将新旧数据进行拼接
				this.goodsList = [...this.goodsList,...res.message.goods]
				this.total =res.message.total
			},
			gotoDetail(goods){
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+goods.goods_id
				})
			}
		},
		onReachBottom() {
			  // 判断是否还有下一页数据，当前的页码值 * 每页显示多少条数据 >= 总数条数
			if(this.queryObj.pagenum*this.queryObj.pagesize >=this.total) return uni.$showMsg('已经到底了')
			 // 判断是否正在请求其它数据，如果是，则不发起额外的请求
			if(this.isloading) return
			//让页码值自增+1
			this.queryObj.pagenum++
			this.getGoodsList()
		},
		onPullDownRefresh() {
			//重置关键数据
			this.queryObj.pagenum=1
			this.total = 0
			this.isloading= false
			this.goodsList=[]
			
			//重新发起请求,请求完成后停止下拉刷新
			this.getGoodsList(()=>uni.stopPullDownRefresh())
		}
	}
</script>

<style lang="scss">

</style>
